"""
Project Euler Problem 1: https://projecteuler.net/problem=1

Multiples of 3 and 5

If we list all the natural numbers below 10 that are multiples of 3 or 5,
we get 3, 5, 6 and 9. The sum of these multiples is 23.

Find the sum of all the multiples of 3 or 5 below 1000.
"""

# _*_ conding:UTF-8 _*_
'''
@author = Kuperain
@email = kuperain@aliyun.com
@IDE = Thonny Python3.8
@creat_time = 2022/5/3
'''

def solution(n: int = 1000) -> int:
    '''
    >>> solution(10)
    23
    >>> solution()
    233168
    '''
    return sum(x for x in range(3,n) if x%3==0 or x%5 == 0)


if __name__ == "__main__":
    import doctest
    doctest.testmod(verbose = True)
    
    print(f"{solution() = }")